碩士 / 國立交通大學 / 環境工程系所 / 104 / The raw water of waterworks in Matsu area is mostly taken from reservoirs. A large number of algae blooms occur in summer season in reservoirs and lower the operational performance of waterworks. NaOCl oxidant is commonly used in WTPs as a disinfectant to degrade the algae and their metabolites or dissolved organic matter (DOM) for approving efficiency in coagulation and sedimentation. However, pre-chlorination probably induce cell lysis and the release of algogenic organic matter (AOM) from algae to increase in the amounts of disinfection by-products (DBPs), such as trihalomethane (THM). The characteristics of AOM from different algae species strongly affect the formation potential of THM.
This study aimed to investigate the relationship between differences on the characteristics of AOM from algae in various raw waters from Shengli and Chushuiwo waterworks in Matsu and the corresponding THM formation potential (THMFP). The algae-laden solution was concentrated by ultrafiltration and then AOM was collected through algae breaking process to a desired dissolved organic carbon concertation as high as 5 mg/L. Excitation-emission matrix fluorescence spectroscopy and high performance liquid chromatography-size exclusion chromatography methods were used to quantify the composition and molecular weight distribution of the AOM. The corresponding THMFP was determined by using excess chlorine dose at a given Cl/DOC ratio (5:1). The results indicated that dominant algae species in Shengli and Chushuiwo are Monoraphidium and Melosira, respectively. The predominant components of AOM and DOM in Shengli and Chushuiwo are protein-like and humic-like substances, respectively. The AOM contains the majority of soluble microbial by-product-like substances with small molecular weight (<100 kDa). After chlorination, the most of SMP substantially degrade. The results of EEM survey suggested that the averaged fluorescence intensity ratio between fulvic acid-like substances and SMP in AOM solution is well-correlated positively with the corresponding THMFP. In addition, the THMFP for DOM in various raw waters was much more than that for AOM because DOM is composed of a large number of humic-like substances. It was found that the quantity of THMFP after chlorination increases with increasing the amounts of bromine ions in raw water.
| Identifer | oai:union.ndltd.org:TW/104NCTU5515018 |
| Date | January 2016 |
| Creators | Wong, Sih-Yuan, 翁思源 |
| Contributors | Huang, Chih-pin, 黃志彬 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 75 |
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